Entitled The Secret Armory of General Knoxx, this expansion will be available on the PC, Xbox 360, and PlayStation 3. Gearbox tells us this new DLC will be the largest to date for Borderlands, introducing new weapons, new enemies, and a "huge new environment complete with tons of brand new missions." The character level cap will also be raised, presumably allowing players to become mightier and more destructive than ever:

This DLC extends the Borderlands experience, providing new challenges and opportunities for growth for characters from around level 34 to level 50. Growth for characters at 50? Yeah, that's right, we've raised the level cap; even players who think they've seen it all have tons more to do! The Secret Armory of General Knoxx offers hours of thrilling shooting and looting for Borderlands players!

Gearbox didn't share a release date with us, but it did send us a couple of screenshots. You can check them out in the image gallery below.